noun
exit for alighting passengers
Used for the designated exit where passengers get off a vehicle, especially in public transportation contexts like buses or trains.
バスの降車口は後ろにあります。
The exit for alighting is at the back of the bus.
Compound of 降車 (こうしゃ, 'alighting from a vehicle') and 口 (ぐち, 'opening, exit').